Hydraulic recoil apparatus for ordnance



A.BREMBERG. HYDRAULIC RECOIL APPARATUS FOR ORDNANC E.

APPLICATIONJFILED JUNE 24' I920-,

1 39 172 Patented Nov. 22, 1921.

INVENTOR flxsi BREN\5ERG.

Wi s

. AXEL BnEMBER-dpr GLASGOW; swims.

HYDRAULIC nnco pnrrermrvs FOR onnivn nonl' 398,172. Specification ofetters ntf Patented N .22,- 1921.

Application filed June 24,

7 the recoil and return the gun is controlled by the pass of liquidthrough apertures, and has for s object to provide improved valvedevices for so controlling these aper tures that the movement of thegun, particularly during its return to tiring position, is as rapid asmay be. while at the same time it is so gradually checked that it comesto rest without shock.

According to the invention. while the flow of liquid under the moment ofrecoil is jointly controlled in known manner by constant leakageapertures and by a valve disposed in the annulus between the usualpiston rod and the recoil cylinder in which it operates and sospring-loaded as to open under the moment of recoil but remain closedduring the return movement of the gun. the return movement of the gun iscontrolled jointly by constant-leakage apertures and by another valve.also located in the annulus between the piston rod and recoil cylinderand closed during the recoil, but so spring-loaded that during thereturn movement it opens at the beginning of that movement and while thepressure in the liquid is high. but is closed against that pressure bythe action of the spring when the pressure falls to a predeterminedpoint and remains closed for the remainder of the return movement. Thus,as the liquid passes throiwh both the constant leakage and thevalve-controlled apertures during the first part of the return movement,that part of the movement may be very rapidly performed, but as thevalve closes with the fall of pressure, the available area for thepassage of liquid becomes less and less. and thus the speed of returngradually diminishes and the gun is finally brought to rest withoutshock although the return move ment as a whole is very rapid.

An illustrative example of the carrying out or" the invention as appliedin the recoil 1920. Serial Noi 391,299.

apparatus forming the subject-matter of the prior U. S. Patent No.1,385,801 is shown in longitudinal sectional elevation in Figure 1 of anaccompanying sheet of explanatory drawings, Figs. 2 and 3 thereof beingviews at right angles to one another of a detail.

In this example, the parts are arranged in the annular space between thepiston rod A and the cylinder B in which it moves. The valve'openingunder the moment of recoil 5 is of annular form and is shown separatelyin section and in elevation respectively in Figs..2 and 3. It consistsof a sleeve-like part C sliding upon the piston-rod A and an annularface part D which coacts with a seat formed upon the inner periphery ofa sleeve through the grooves tothe space beyond.

Through the sleeve E and radially beyond the valve seat isan annularseries of apertures H. These apertures at the end of the sleeve E remote"from the recoil valve are closed by an annular valve J held up againstthe end of the sleeve Eloy a spring K in compression between it and aninturned flange. on a sleeve L fixed in the cylinder 13. This deviceforms the valx' eclosed during recoil but opening under the initialheavy pressure of the return n1ovement,-and the spring K loading it isof such strength and is so adjusted that it forces the valve J back uponits seat on the end of the sleeve E, so closing the annular series ofapertures H when the pressure of return falls to a pre- 5 determinedpoint, thus reducing the area available for the flow of the liquid andthus checking the speed of return, and finally bringing the gun torestwithout shock.

hat I claim is:

1. In hydraulic recoil apparatus for ordnance, in combination constantleakage apertures and a valve so disposed and so spring' loaded as toopen under the moment of recoil but to remain closed during the returnmove- 1 5 ment and a second valve controlling the return movement.closed during recoil, but so spring-loadedthat it opens at the beginningof that movement but gradually closes and remains closed during thelatter part of the 110 return move'mentilioth valves being locatedspring pressing said valve to closure position 10 in the annulus betweenthe piston rod and so that While the valve moves to Open the the recoilcylinder in which, it operates, as ports during the initial part of thereturn and for the purposes set forth. movement, it thereafter graduallycloses and 2. In hydraulic recoil apparatuga ported remains vclosed for.the latter part of that sleeve fixed in the recoil cylinder and locatedmovement. i y 15 in the annulus between the piston rod and In testimonywhereof I have signed my the recoilcylinde'r in which it operates; anname to this specification. annular valve controllin-gjsaid ports, and av AXEL BREMBERG.

